electric fan - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Electrical
User Name
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 06-11-2006, 03:52 PM
CARGUY's Avatar
Last photo:
Join Date: May 2002
Location: granite city,illinois
Age: 42
Posts: 180
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
electric fan

i got a 1996 chevy lumina with a 3.1 in it and the problem is only one cooling fan will work. one fan will run when you turn on the a/c but the other fan wont start. i checked the relays, and fuses they were fine. i ran a jumper to the fan and it started to run so the motor is good. is the fan switch bad if so does anyone know where the fan switch i located on this car?

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 06-12-2006, 03:09 PM
vicrod's Avatar
life is a ride

Last journal entry: 2014
Last photo:
Join Date: Nov 2005
Location: Telford, PA
Age: 74
Posts: 1,545
Wiki Edits: 0

Thanks: 3
Thanked 99 Times in 94 Posts
You will need to get a shop manual that shows the location of the temperature sensor.
It will be located on the engine in the cooling system but possibly it sends a signal to the computer and the computer decides when to run the fan.
Also it's possible that the engine in not getting hot enough to need the fan.
A good source for this information is www.alldatadiy.com or your local Library.

Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-12-2006, 03:35 PM
docvette's Avatar
Registered User
Last wiki edit: Rebuild an alternator Last photo:
Join Date: Mar 2004
Location: Lafayette, california
Age: 65
Posts: 7,360
Wiki Edits: 12

Thanks: 0
Thanked 7 Times in 4 Posts
Doc here,

Vicrod hit it right on the head..

The Computer controls the signals to the relay (s) , Pins 31 and 32 of the ECM are for control of the relay switching, and Pin 52 of the ECM controls the Air conditioner switching of the cooling fan..ALL of these are low data signals.

The Schematic DOES not show where the relay gets it's power from, I assume it's from a switched source at the convenience Center, or fuse panel or fuse link in the engine bay..

You need to determine that the relays are actually switching as needed, by either running it up to temp "feeling the relay (s) for a "Click..OR remove the relay (s) and jumper between the Center Wiper contact and the Normally Open Contact.

If jumpered, and still won't run the fan (s) you either need a better diagram that shows where the relay CONTACT picks up power..OR ..Hand over Hand the wire from the relay socket to it's termination point, then measure for Power at said point...If it is dead..find out what feeds it and replace / repair as needed.

If it does run..then you need to look into the Temp sender switch, It will be mounted traditionally in one of three places..The intake manifold water jacket, the t'stat housing , or the radiator lower tank. Test or replace this switch.

Reply With Quote Quick reply to this message

Recent Electrical posts with photos

Quick Reply

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Electric Fan Temp. Sensors horvath Electrical 26 04-26-2011 03:04 PM
Need advice on a good electric fan set up. Streetmaster Engine 13 01-07-2006 02:37 PM
? about an electric fan for PU. Streetmaster Engine 8 08-20-2005 10:14 PM
TPI electric Fan HELP! boneyard Buick Engine 4 07-31-2005 12:21 PM
electric fan or clutch fan?? mancinator Engine 4 06-02-2004 02:49 PM

All times are GMT -6. The time now is 06:17 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.